Stop 2-stroke outboard motors from smoking. My Evinrude 200 HP 1997 would smoke out the neighborhood every time I cold started it. This helped cut the smoking down. See the results in the video. Judge for yourself. UPDATE: ANY 100% SYNTHETIC TC-W3 2-STROKE OIL (NOT SYNTHETIC BLENDS) WILL WORK JUST AS WELL AS AMSOIL! NO NEED TO PLAY THE AMSOIL OIL HUNT GAME. I now use Evinrude 100% Synthetic X-D 100 with even better results. My motor runs much smother now also! Please try it and leave your smoking comments!.